Taking a lot of vitamin A every day for about three weeks might help two healthy people absorb more beta-carotene from their food, based on how much showed up in their urine over the next month.

Taking a specific dose of vitamin A every day for about three weeks might make your body get rid of much less of a certain form of beta-carotene through urine, based on a small observation in two healthy adults.

Taking a lot of vitamin A every day for about three weeks might make your body break down beta-carotene (from food) into vitamin A less efficiently.

After taking vitamin A supplements for three weeks, two people ended up getting more usable vitamin A from beta-carotene—even though their bodies were breaking it down less, which is kind of surprising.

Eating more fruits and vegetables for 3 months makes the level of alpha-carotene—a plant nutrient—in the blood go up by 50% in people who didn’t eat much before.

When people eat a lot more fruits and veggies for 3 months, the levels of two important plant pigments—beta-carotene and lutein—in their blood jump by 70%, showing their body is absorbing more of these beneficial compounds.